All of the following result from overgrazing in semiarid regions except regeneration of grasses soil compaction reduced local rainfall topsoil erosion

regeneration of grasses

Semiarid region are subtype of dryland. These regions are drought regions. The soil in these regions is dry and degraded.  This region receives very low rainfall. The soil lacks essential organic humus, nutrition and appropriate moisture content. Therefore, grasses will not regenerate after overgrazing.

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

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explanation: